The CPU (Central Processing Unit) is the part of a computer that performs tasks instructed by the computer programs. Its role is somewhat analogous to that of the human brain; it performs simple mathematical, logical, and in/out operation of the machine.

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kernel_task hundreds of % CPU yet cpu frequency is being lowered

I'm trying to solve the mystery of a crazy high cpu usage on kernel_task. MacBook Pro (Retina, Mid 2012), 2.7 GHz Intel Core i7, Yosemite 10.10.2 I saw some advice to download the Intel Power ...
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2answers
1k views

CPU usage is too high with Yosemite and an external monitor

I use Yosemite 10.10.4 on my MacBook Pro (2012). I used to work with an external monitor: Apple Thunderbolt 27" monitor. The issue is that, according to Activity Monitor, the kernel_task process ...
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4answers
4k views

Limit processor speed like in Windows

In Windows (Linux too), you have the very useful "Power saver" mode that limits the maximum frequency at which your CPU runs. Is there something similar in OS X?
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mds and mds_stores constantly consuming cpu

mds and mds_stores are constant CPU consumers even when I think nothing should have changed on the hard drive. activity monitor I have a circa 2009 Macbook Pro. Lots of software installed over the ...
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1answer
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Why is my Mac's CPU throttled? (Turbo Boost Ratio)

AnandTech has a instructions1 on how you can check the Turbo Ratios for the Mac's CPU. Since they are logged, the information is very easy to find. In Mountain Lion you can do this the following ...
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4answers
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Why does SystemUIServer cause high CPU usage?

The SystemUIServer process is taking 30% of my CPU. Searching around reveals a Snow Leopard daylight savings bug which is solved by removing the clock from the menubar. I am on Lion and I have tried ...
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4answers
750 views

Is there a way to show each CPU's load separately?

I'm seeking an equivalent of a common Linux based process monitor, which shows a history graph for each CPU core. This can help identify programs that are effectively using all the cores (here, ...
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1answer
2k views

Why does Apple Activity Monitor report that my Mac with a dual-core Intel i5 Ivy Bridge CPU has 4 cores?

I just got a new Apple MacBook Pro 13", mid-2012, which has a dual-core Intel i5 Ivy Bridge CPU. When I run Activity Monitor and turn on the Floating CPU Window, it shows a 4-bar graph (indicating 4 ...
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1answer
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iPhone: What is `accountsd` and why is it using 80% CPU?

I just got a new iPhone 6 for my SO and noticed that it is quite toasty to handle with the battery draining quite fast. It has been 24 hours since I first set it up. I plugged it into Instruments ...
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2answers
2k views

kernel_task is using 90% CPU, what could be the cause?

I have a 13" MBP late 2009, 2.53 GHz, 4 GB RAM, and on OS X 10.8.3. As soon as I boot up the fans start going at the highest rpm and like I mentioned the kernel_task is always at around 90% when no ...
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Why does Google Chrome Helper spike my CPU?

This has been happening on and off since I switched to a mac at work. Google Chome Helper occasionally runs my cpu into the red and has the fan spinning madly. Sometimes restarting Chrome fixes the ...